Numerical analysis of wood biomass packing factor in a fixed-bed gasification process

González, William A.; Pérez, Juan F.; Chapela, Sergio; Porteiro, Jacobo

doi:10.1016/j.renene.2018.01.057

Cited by 38 publications

(18 citation statements)

References 30 publications

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“…The reactor mainly had an internal diameter of 102 mm, an external diameter of 185 mm, and a bed length of 400 mm. A description of the experimental setup is presented in detail in previous works . The behavior of this reactor is similar to that of TLUD cookstoves operating only with primary air.…”

Section: Methodsmentioning

confidence: 99%

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Effects of wood biomass type and airflow rate on fuel and soil amendment properties of biochar produced in a top‐lit updraft gasifier

Díez

Pérez

2018

Env Prog and Sustain Energy

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In this study, the effects of biomass type and airflow rate on the fuel and soil amendment properties of a solid byproduct (biochar, BC) produced by gasification in a top‐lit updraft reactor are studied. The results indicate that biomass with the highest fuel value index produces BC with the highest quality as a solid fuel. The best properties as a soil amendment are reached by Gua‐30‐BC as follows: the cation‐exchange capacity (CEC) of 18.6 meq/100 g, the water holding capacity (WHC) of 438%, and the total oxidizable organic carbon (TOC) of 14.2%. When the airflow increases from 20 to 40 L/min, the properties of pine BC as a solid fuel are affected. An increase in the gasification temperature leads to a diminished bulk density. Moreover, the ash content increases affecting the heating value of BC, which decreases from 27.71 to 25.5 MJ/kg. The best properties of BC as a solid fuel are reached at 20 L/min. The properties of BC as a soil amendment are affected with increased airflow as follows: the CEC decreases by 22.8%, TOC increases by 232.3%, and WHC increases by 7.6%. The best properties of BC as a soil amendment are obtained at 40 L/min. © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13105, 2019

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Section: Methodsmentioning

confidence: 99%

“…The two main changes on the chemical surface structure of biochars identified by Fang et al [39] are the dehydration and aromaticity. Thereby, in this work, the aromatic index was estimated as proposed by Brewer et al [40] according to Equation 4:…”

Section: Physicochemical and Thermal Characterizationmentioning

confidence: 99%

Effects of wood biomass type and airflow rate on fuel and soil amendment properties of biochar produced in a top‐lit updraft gasifier

Díez

Pérez

2018

Env Prog and Sustain Energy

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“…When the agreement between both experimental and simulated results is not sufficient, the model is usually later improved or even reformulated, aiming at obtaining results closer to the empirical ones . For example, Gonzalez et al found certain discrepancies among the predicted and experimental data for H 2 , CH 4 , and CO 2 during gasification in a fixed‐bed reactor, subsequently affecting the estimation of other dependent parameters, such as the heating value. In most of the cases, a review is assumed to be required in the model, regardless of the possible (and more probable) inaccuracy of the experimental reference data.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Feeding Rate on the Transient Behavior of a Biomass Combustor

et al. 2019

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Monitored variables in biomass combustion devices, such as emissions or temperature, are usually characterized by their averaged values over the entire process, although they tend to present a pulsating behavior. This assumption induces instantaneous errors when experimental data are used in numerical simulation. The interest in obtaining high‐quality experimental information for a proper model validation leads to find an alternative to describe them and to discern which operating variables are the main ones responsible for those fluctuations. The application of frequency‐domain tools, such as coherence, is proposed as a useful solution for determining if the emission and temperature profiles are intrinsically related to any known periodical signal, such as the feeding cycle.

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“…Non-experimental sensitivity analysis under various operating conditions is quite commonly applied, providing a deep insight into the process at minimum cost, while also facilitating design optimization. Detailed Computational Fluid Dynamics (CFD) calculations have been thoroughly used for the modeling of biomass gasification reactors [15,16]. Given that the goal of the model is to predict the overall process efficiency and the general behavior of the gasifier operation, simple 0-D global models are preferred.…”

Section: Introductionmentioning

confidence: 99%

Integrating LCA with Process Modeling for the Energetic and Environmental Assessment of a CHP Biomass Gasification Plant: A Case Study in Thessaly, Greece

Voultsos

Katsourinis

Giannopoulos

et al. 2020

Eng

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The energetic and environmental performance of a cogeneration biomass gasification plant, situated in Thessaly, Greece is evaluated via a methodology combining process simulation and Life Cycle Assessment (LCA). Initially, the gasification process of the most common agricultural residues found in the Thessaly region is simulated to establish the effect of technical parameters such as gasification temperature, equivalence ratio and raw biomass moisture content. It is shown that a maximum gasification efficiency of approximately 70% can be reached for all feedstock types. Lower efficiency values are associated with increased raw biomass moisture content. Next, the gasifier model is up-scaled, achieving the operation of a 1 MWel and 2.25 MWth cogeneration plant. The Life Cycle Assessment of the operation of the cogeneration unit is conducted using as input the performance data from the process simulation. Global Warming Potential and the Cumulative Demand of Non-Renewable Fossil Energy results suggest that the component which had the major share in both impact categories is the self-consumption of electricity of the plant. Finally, the key conclusion of the present study is the quantification of carbon dioxide mitigation and non-renewable energy savings by comparing the biomass cogeneration unit operation with conventional reference cases.

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Numerical analysis of wood biomass packing factor in a fixed-bed gasification process

Cited by 38 publications

References 30 publications

Effects of wood biomass type and airflow rate on fuel and soil amendment properties of biochar produced in a top‐lit updraft gasifier

Effects of wood biomass type and airflow rate on fuel and soil amendment properties of biochar produced in a top‐lit updraft gasifier

Influence of the Feeding Rate on the Transient Behavior of a Biomass Combustor

Integrating LCA with Process Modeling for the Energetic and Environmental Assessment of a CHP Biomass Gasification Plant: A Case Study in Thessaly, Greece

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